Red etap wi fli electronic road groupset at sram we know that if a technological advancement clutters the experience it shouldnt be called an advancement because its a bicycle its supposed to be simple to make something elegant to the point where it removes whats in the way thats advancement that is the standard we held ourselves to while developing our first electronic shifting system sram red etap wi fli allows you yo use a cassette upto a 32t sprocket perfect for hill climbing kit